Which one of the following explains why Lily can see the book on the table?

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Which one of the following is not a source of light?

• Sun

• lit candle

• firefly

• moon

Which one of the following explains why Robin could not see the table?

• The table did not reflect light.

• The table did not give off light.

• The wall did not allow light to pass through.

• The table did not allow light to pass through.

Tags

NGSS.MS-PS4-2

Kenny arranged sheets X and Y, made of different materials, in a straight line. Sheet X has a round-shaped hole in the center. In a dark room, when he switched on the torch, a dark shadow with a bright spot in the centre was seen on the screen.

Kenny can conclude that __________________.

• only sheet X allows light to pass through

• only sheet Y allows light to pass through

• both sheet X and Y allow light to pass through

• both sheet X and Y do not allow light to pass through

Tags

NGSS.MS-PS4-2

The diagrams below show 'glow in the dark' balls inside some boxes. Kent looked through the opening in each box as shown by the arrow. Which box(es) will Kent be able to see the ball from the opening?

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At room temperature, the ball was able to pass through the ring. After heating the ball for a while, the ball was unable to pass through the ring.

Which of the following explains this observation?

• The ring expanded and the ball contracted.

• The ring contracted and the ball expanded.

• The ring contracted and the ball contracted.

• The ring remained the same and the ball expanded

Tags

NGSS.MS-PS1-4

Four similar cups, A, B, C, and D were filled with equal amount of water at different temperatures. Which cup has the most heat?

• Cup A

• Cup B

• Cup C

• Cup D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why does holding the hot noodles above the cup help to cool the noodles?

• Heat is gained by the noodles from the cup.

• Heat is gained by the noodles from the chopsticks.

• Heat is lost from the surrounding air to the noodles.

• Heat is lost from the noodles to the surrounding air.

Tags

NGSS.MS-PS1-4

The diagram shows a cup filled with hot tea at 80^oC.

Which graph below shows the correct temperature change in the water over 3 hours after the cup was left on the dining table?

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Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Faye conducted an experiment using four different materials, W, X, Y and Z. She wrapped four identical cups with each of the materials and poured an equal amount of cold water into all the cups.

She recorded the changes in the temperature of the water in the cups and presented her results in the graph above.

Which material is the best conductor of heat?

• Material W

• Material X

• Material Y

• Material Z

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4